Multiple-screw jack



J. CORYELL.

MULTIPLE SCREW JACK.

APPLICATION men AuG.13.1.92c

.is hollow ees efe eppiimien eine To of whom it may fon/cem jacks of 'jvpe in which one screw roi-etes or eiescopee inside he other. The object of "she invention is; oeiete euch jack. .by e eoneiniious ioniy 4inoveiziene as (listin gnisiied, from a i'atehet movement and to do i@ in euch e manner tha ehe jack operates eompsieiveiy rapidlyj ih-eieb'y espeeialy eopfig it for iig-iii Work such as on plensme eetomobilee and iightrueks. The invention consists in e. nove. combination of parie attaining the foregoing and other de-v eiiebie objeee Wiiioh een be easiiy end Cornpeetiveljv eiieepiy made, which is setisao ory in the use and is not readily Hable to get ont. of onder. More in deeil. the invenioi consists in nia-ny features and detaiief of eonsiiictionmore fully sei, eoe`-ieetion end claims.

Referring' io elle oiaivinge in which ike nnineeis denoe like hrongione the eiel views7 figne l i mechanism iijeemting gj 'iered oim e ,y lei elevation of this invention m ie u, poited upon Suitable-bese 2 of? o-ineiy construe-tion 'fin she oor. The eide oi ieerebiy provided. with a, e nich 'ne entire mechanism iene-'ly iff-imported 'by the on i Vee heid. of this handle. mounted on this oase l@ enel movement only theieoi"L veftieai by one henc. e l and ehe giiicie screw 16 entei'ing snitebie .Slots 1'? and i9 ieepeetivei; e 18 pefei'eb'v mede in two ehe i* ete 18EL being e cove? ree dezoiieffmy seemebie normal position ey one or more seeuiing devices, eue-h es a. Series of eioinnfei'entiel set screws 20 only one of 'which is shown ese l0 is vevieeiv bored end px@ vieeii 'vvieleoew feeds 22 i lh whieh'im threede on what -vvii oe Specification of Letters iatent.

weites, residing ai; De,

Tele

we "ew ew we hereeikei nel screw by any Suitable ineens, ne oi ingence by e wrench (not shown) eppiied 'io the nonneiscular end 36 of fois ehefj- The lower ano; ouei sere/iv n and ite inteiioi is provided with .inei 1 screw thieeds 38 'of opposite pitch from thi'eas 2%, with which intei; ,screw tii'eefis on what will be hereafter re'eired "zo :is he inner or upper screw 412%. 42 ce1-ries :it is appel' end e ioed Ceiiying block e rotatably mounted on the member 46.

Exten( ing eiong i e eng'th of' SeifenT 4:2 isn keyway 4S siideby entered by 50 i'igidly mouni'zed in. the hub 52 of e second Yevei gear jouineied in the 18a o' the end meshing' mf i by bevel pinion eieieoioie This xviii be ieeifei'i :is e, Si -ion.

inv *die ege-ration of e toi" Wrench oi* ioaeingpini'on i i tion with 'Lehe i'esui't that gems eno,

die iiftinle; operation as one screw 'were need, and L' i lift is, eoifole, Y (assuming 'boel he of sofe'iv threads have the pito The base and ease ae eeen nonmenibeis.

Having thus described my invention Wim@ claim as new and desi'e to eeeuie ters Patent,

l. n ineceanisn the ,combinaion of' ivo sepA 'tambie ers, one of Wi per of seien-'e .ele-,eee f i* ping This seiten'- and with the non-rotatable members, screw threads between said screws, other screw threads between one screw and one non-rotatable member, ar driving gear for the last mentioned screw, another gear for the other screw splined thereto and )ournaled 1n the other non-rotatable member, and means simultaneously rotating said gears in su'ch directions that the screws travel in opposite directlons longitudinally of each other and in the same direction with reference to the non-rotatable member in which one screw is threaded.

2. ln mechanism of the class described, the combination of two separated non-rotatable members, one of which is a base, a

pair of screws telescoping with each otherv one screw .is threaded.

' 3. in mechanism of the class described, the combination of two separated non-rotatable members, one of which is a base member, a pair of screws telescoping with each other and with the non-rotatable members, screw threads between said screws other reversely pitched screw threads between one screw and one non-rotatable member, a driving gear for the last mentioned screw, another gear for the otherscrew splined thereto, and jonrnaled in the" other non-rotatable member and means simultaneously rotating said gears in opposite directions so that the screws travel in opposite directions longitudinally of each other and in the same direction with reference to the non-rotatable member in which one screw is threaded.

4. ln mechanism of the class described, the combination of two separated non-rotatable members, one oi which is a base,

means permitting reciprocation of one of said members with reference to the other, a pair of screws telescoping with each other and with the non-rotatable members, screw threads between said screws, other screw threads between one screw and one non-rotatable member, a driving gear for the last vmentioned screw, another gear for the other screw splined thereto and journaled in the other non-rotatable member, and means simultaneously rotating said gears in such directions that the screws travelin opposite directions longitno'linally of each other and in the same direction with reference to the non-rotatable member in which one screw Vthreaded into the base,

is threaded, the gears and driving mechanism being all inclosed in and protected b one of the non-rotatable members.

5. In mechanism ofthe class described, the combination .of two separated non-rotatable members, one of which is a base, means permitting reciprocation of one of said members with reference tothe other, a pair of screws telescoping with each other and with the non-rotatable members, screw threads between said screws, other reversely pitched screw threads between one screw and i one non-rotatable member, a driving gear for the last mentioned screw, another gear for the other screw splined thereto'and journaled in the other non-rotatable member, and means simultaneously rotating said gears 1n such directions that the screws travel in opposite directions longitudinally of each other and in the same direction with reference to the non-rotatable member in which one screw is threaded, the gearsand driving mechanism being all inclosed in and protected by one of the non-rotatable members. 6. In mechanism of the class described, the combination of two separated non-rotatable members, one of which is a base,- means permitting reciprocation of one of said members with reference to the other, a pair of screws telescoping with each other and with the non-rotatable members, screw threads between said screws, other reversely pitched screw threads between one screw and one non-rotatable member, a driving gear for the last mentioned screw, another '100 gear for the other screw splined thereto and journaled in the other non-rotatable member, and means simultaneously rotating said gears in opposite directions so that the screws travel in opposite directions longitu- A ,i

dinal'ly of each other and in the same direc- -tion with reference to the non-rotatable member in which one screw is threaded, the gears and driving mechanism being all in,- closed in and protected by one of the non- 11o rotatable members. 7. In 'mechanism of the class described, in combination withy a base, one screw a second screw linside thexrst screw, threaded therein, the screw threads between the base, and the first screw being in one direction and the other set of screw threads being in the opposite direction, a pair of gears, one for each screw, mea-ns driving said gears in opposite directions, means rigidly securing one of said gears to one screw, and a spline con-` nectlon between the other gear and the other screw, and a lsupport for the last mentioned gear, for the purposes set forth. 8. In mechanism of the class described, 1n combination with a base, one screw threaded into the base, a second screw inside the first screw, threaded therein, the screw threads between the base and the first 130 eet forth.,

screw4 being in one direction and the other set of screu7 threads being in the opposite direction, a pair of gears, one for each screw, means driving said gears in opposite directions, means rigidly securingone of said gears to one screw, and a spline connecting between Athe other gear and the other screw, a support for the last mentioned gear, a case inclosihg the gear mechanism, and ineens connecting said case to the base Whereby the case may reciprocate With reference to the bese, but may not rotate with reference to it.

in mechanism of the class-"described, the combination of e base, a case telescopically mounted. with reference to the bese, but held against rotation with reference thereto, a pair of telescoping sere vs, screw threaded together, a reversely pitched screw threaded connection between one of said screws and a hase, a pair'o bevel gears inside the case,

one driving each screw, means simultaneously driving said gears in opposite-directions, a spline connection between 'the screw which is not in engagement with the base, andthe gear which drives it, and a supgort for the last mentioned' gear, for the purposes l0. ln mechanism of the class described, thecombination 'of a hase, a case` telescopically mounted TVith reference tothe hase, lout eid against rotation with reference thereto, a pair of? telescoping screws screw tineaded together, a revers/ely pitched screw the screw* which is not in enoaeernent with i the base, and the gear Which drives it, a support vfor the last mentioned gear, and a 'load carrying block pivotally mounted on.

'the end of the last mentioned sc1'eW,"or the purposes set forth.

ll. ln mechanism of the class described, a base, a hollow cose mounted for reciprocation on the base, means preventingv rotation of the case on the hase, a bevel gear in the case, a screw rigid with the bevel gear passing through and screiiv threaded into the base, and oppositely placed bevel gear also in the case journaled in the case, means driving said gears operaia-able from outside the case, and a second screw passing through both sets of gears and splined to the which is journaled in the case, pa through the first mentioned screiv threaded to it in threads o from the threach opposite pitch between the iirst screw and base,'for the purposes set Jforth.

In Witness whereof, have hereunto snif scribed my name in the presence of two Witnesses.

JON GRTEL@ lVitnesse DWIGHT B. CHEEVER, ANNA RosENTHnL. 

